Luz

or Luez .The indestructible bone; the nucleus of the
resurrection body.

“`How doth a man revive again in the world to come?' asked Hadrian;
and Joshua Ben Hananiah made answer. `From luz in the backbone.' He
then went on to demonstrate this to him: He took the bone luz, and put
it into water, but the water had no action on it; he put it in the
fire, but the fire consumed it not; he placed it in a mill, but could
not grind it; and laid it on an anvil, but the bammer crushed it
not.” —Lightfoot.

The learnéd rabbins of the Jews
Write there's a bone, which they call luez ...